BackboneJS - View Remove

BackboneJS - View Remove

<!DOCTYPE html>
<html>
   <head>
      <title>View Example</title>
      <script src = "https://code.jquery.com/jquery-2.1.3.min.js"
         type = "text/javascript"></script>

      <script src = "https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js"
         type = "text/javascript"></script>

      <script src = "https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js"
         type = "text/javascript"></script>
   </head>

   <body>
      <div id = "mydiv"></div>
      <script type = "text/javascript">

         //'ViewDemo' is a name of the view class
         var ViewDemo = Backbone.View.extend ({

            //When click event occurs it activates the defined function 'removeFunc'
            events: {
               'click button': 'removeFunc'
            },

            removeFunc: function () {
               //the 'remove()' method removes the view from the DOM
               this.remove();

               //After removing the view, it shows length as '0'
               document.write("After removing, view becomes: ",$('#mydiv').length);
            },

            //'render' provides the logic required to construct the view
            render: function () {

               //'$el' is cached object that push the content defined within it and
               //display the button which should clicked by the user to remove the view
               this.$el.html('<button>click to remove</button>');
            },

            //This function is called when the view is instantiated
            initialize:function(){this.render();}
         });

         //'myview' is an instance of the 'ViewDemo' class
         var myview = new ViewDemo({el: '#mydiv'});
      </script>

   </body>
</html>